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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97ae2b17a5e1e44f9e1b9a6a10ed1895b9d7f46955bb046f267c5396a9b87e4' 
  AND token = 'QO5BW5gDtycm7iYnvWejelScyK+IoU5vhcmH5Gio2k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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