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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56f757ff882a61737c9da6c63074c883c63168b1af17f422ef38f6e94c72ac2' 
  AND token = 'uYsx5AlmkSTpOQhaQ8ZVcmmwesqYPy7eHa0+awb8eM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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