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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ae06e3bf78769ec1f6941b0ab0554c4eff2d9a9aaa1472563d30774bf4e8ee' 
  AND token = 'VSmJsdzrVL4IqW5nWuizgygFN6uaHmP+rylG+DLbM/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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