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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a561181024e6a33975a8fc3dd23a9fb0d5d704d117c7d8a3daaa5e903853c7' 
  AND token = 'N5hWV7RwSBFYcks74knK60V9JSEAI8fg27j9Zo7slrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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