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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8465dded7451de7591e6469355881870068ee4749d5bacedd59e2a4b85a5d13' 
  AND token = 'P60h1g5fP4FwfXSVe1XdCXXItuertkQ7UiAtcJLD9LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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