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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0f3207106c4cccccb3656b33a61870f68061783a82fcfef8cc26595433a3d4' 
  AND token = 'lEcCgDJOaJEEiqvedOoQ8ku0I1Y3dpieMZqMIQk8gtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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