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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a54588a44b731afba36c1fb6e76b204dfc89720bd07aca283ae1df3da2c00e' 
  AND token = 'WQOu10VBAocaI/Ii77bAbtgOVmdrNgeF4KTJw6a+4JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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