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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6987eae3b9efa322b31ee1366c86522c55d7d6e9f8212a786e62d8a7a95680d' 
  AND token = 'fLbdFiO9qrNNRAcuE2MHL/9aaWY6ZiUrscO9iiYfOrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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