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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c254ca1e86e7fda4ebbebd90735f7a946b6377466ebd3d070c253cb6aeba1e32' 
  AND token = 'LujRNZF2PQaL+Q17J1pp08SBYscVxEdppEtvSWAYqTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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