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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0460b271e17cc8c341beeb0df4f036572e19adb2019e31d60c38f46714dfd3b' 
  AND token = '9CC+XtMn3zZvq10A83oWyMgFUlD5lD9JiqRZ5YNercA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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