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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471fe24b35bd6647afbc1fd55b459df23773b1c588a488f2d1720891a1c7a7c9' 
  AND token = 'eByYtKWM9s0S5ff6kYmMgyxVeBWbY4wcFSuj7drGMZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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