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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612366febbb19518454c772ed2ea6f8cbbae6d9f7b39765eed6452c356b75b66' 
  AND token = 'JfVhipGxqHOHZTea0MdwIXXfOITFIeO6mwheTpyLCt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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