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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7511c76584575beff33a182c32d1234d40bd55d6cc38dd44bb92795cf6a523' 
  AND token = 'w2srGDM4w9Uf2z8n7Ovf0mke+ix+sEV59qfucvQciNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}