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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc14d5c0e28f8af45c23b3390e16d8dc0066bfece9b9e1e9175b1d7d3adafc68' 
  AND token = 'N+TKibq85xy7dbmMbRoYsivZBAuo2at8T2gl9Mmk01c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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