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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f931310a73a1b599531138638f9fb3204a3632637989c33b1c33188ce3b473c6' 
  AND token = 'bJZEEZ3m9wg8aED2bLO8ABnuSA+RMegw0KUSfjYy320=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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