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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd54a359b770c3054a31622a744826b2315055aed0f52ab7fcfd9b4afc25645' 
  AND token = 'KveashZt3MXZLh3OuWLB0KnzpEjyRrzEygb5zTwzgOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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