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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04018d3ed18f0bc9170da6d728e4abb4e1e52fede5c0c3acc13e4e4832ad730' 
  AND token = 'D0oOEZoUI3hK1wupAPYutcXyNfSXnyw/62lBEwb9tCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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