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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da31ebf61dce10f66ac5af9b47596751927ffa6a10d90231852500b5f3be71e2' 
  AND token = 'sHYAuNcO96rFwjitqv0S6QOIy/toIpKEAlHcFTARAko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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