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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c874d8e2e7239e5f903933418a6b3c09f2db7ba2852ecdb329eee404e638da' 
  AND token = 'udvBgtDbyrhkQX3tQEd5tCRiOK3NDGKEY8F7S4wHf2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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