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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1713cbac047903451565b42650cf786f857fd0f31480bd9eae7be51645f2f4c0' 
  AND token = 'tZto2zxb8MFJ/tVTvYCB0XlYf91GvZL24aXfT1MMfJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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