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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40bf959f3b2781cfbe68b002636d29b3e1f22072397510aa6b1c33356e01a74' 
  AND token = 'S8Mg+6Lh9XZLep6r6bfk9Gwn4aTLhvU5e2m7BtM4GWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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