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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ff915312dcf506afebdc81008dff8a202b277d91973399e3ee53e9cff9e3a1' 
  AND token = '95FMp/ffo1A/KtOCz6F9WJpheliGeaM4w6+IPfs+LbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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