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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026a7c7b9c703629e312ba9a440079018787851004d9435e5293284e20140e94' 
  AND token = 'heyAcEnJFR24Qf0V/MX4mdOG06IQElp3Un6vSI5ypfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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