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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0985d2041e00ce714c5a43eb90791d38ee18bcacb98a532e95e8d2e535b04cea' 
  AND token = 'tls5KwdQtv05A8QtdnWUiA4oi47SYFPwMKLoreW0JwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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