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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028e0f37a1225d7fe00d7a6d40b687c5d601494233df80d39978f3931c5091c8' 
  AND token = 'tiyJwQMIBSH48ZoJyPOx7biIAYLg6z+3wwIfIIzn7PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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