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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0aa558d9f80ffcc08e2bdd81202cb6507f617419427b36cfff87767fe974882' 
  AND token = 'Cdo4PGUtHKlw6uBaHNI3rUxnnl6SOV9MZwr9YbE+j64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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