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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8d456df56de6f8de2dd7c7c03a922bbb8cc575b3d75e1dec089a81cc6b024e' 
  AND token = 'EoBPtmgLojID2F1eO61xrwKK89xC0HPx+/KK5D3xjW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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