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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d4d69d3b2ac3f45ee5ac0007dc8263d7f4cb71ac9fad0a8a41b59d7513b1da' 
  AND token = 'JAGJED8546c7ILu3GhnMp7Kt7EW1MroeNe5N3HN1E98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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