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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9bc1ccb1ecd6ef36fe332f2531d061fdfe676978f8b5f04c9f41be3fe431ec' 
  AND token = 'Xcp28VRaTec9Yfk41POhqbEfItdai6vWBQGhjiMlt6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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