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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e7e6e8c81913628e1152b4c0669ce1d448f1acf63ecf6a3a5dcee04a741fd2' 
  AND token = 'G5eYp1YnIpJYBoitGdkuzdm/g6qSemgrdKWTHMtIhyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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