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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d5abfb1110bcb086655310e69a2b92690aed7c79fcc501b21458baedfdc252' 
  AND token = 'XudZh9Muc8cxmkSDRtrfNZOzhIttbHURFPC06rCLrh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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