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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a5a25682c656800ce00f63a27c423cd9f3962e32ff5697a82805c0c44ffec5' 
  AND token = 'j3i0zPDJONtAD5LHjs6C3eH0kK8pYIkMsTXLn9rzQEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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