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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7808e041604f8287b7b5a537ff102ac47c88e061277f86bbd7d7827770319dce' 
  AND token = 'tSMdShK7Q9Oip0fYEP0lFX6cUCkFhj6Mh+lEHJx1OzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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