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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98adea83b20e350fb8006979ac1569dbaa137cd53afed7cc373b615b318c6ca' 
  AND token = 'L9xgdpgwTWN1nV3bInAcmJCbjnc4VXBDdJGxQD0zWHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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