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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751d094213127c17ff34fe949a81f70622836ddf7ec5777eae8efacd25738d22' 
  AND token = 'c52M/tjJEkL/FmExrTsm8OrNnw7/hkxAcSP/nojiUi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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