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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cb4ebab3eb5c630b7c0633cc7196c4b35449445a834942897e3fabba8a0a70' 
  AND token = '5wGOR4GwuiLyKwJNhSydq11c3i8nbpFwsYVD7jDTCaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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