SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6b4c7c034af59cfeaa575280ce4ede39285f2205917fa398b880101b22265b' 
  AND token = 'jgHdGV12uPJKbonavj1sps5TXJUEDkYgwU6eSQiY7wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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