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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af611047b0d5dc53744a540982c6fa863ea83fee4612fa6a228663b6ec72fa2' 
  AND token = 'FPwUwF0/a8ItRL2+G/kP56n8Uph1OL3wKRiehNi/jGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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