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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192c8e900f2ac6b1b426b05279ec499b814c66d19a72b563f1ec7f1bcc956e68' 
  AND token = 'BFI96T1VgdTcGnP8L7j+Tv9kj89vbMLskw+UJ0o33d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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