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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7437f3ba744bcea9d57bfe93ce95f9e617afe21cac88fd48f1126e2ba6cafa' 
  AND token = '2JvKx+LrEo/36GD2oQGqLtrEu16qBW8hmJLSPWtvG9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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