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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398df97eb1f898b8decd546e1c87472e2991d265f5f79a4ba2d042b3cb57b988' 
  AND token = 'GIN79uXAb1AkmMQ+0IzTKl+dvwM3O9y8gcFLTGrkAtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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