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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11980cba66e9b889c59588cacb17aeb2fb09a1027b1279876e368654ba02dc35' 
  AND token = 'zBj6laOpG5Sffrf3TxK4ok/jtQjKTL9+F+sGhG5WEh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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