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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f979e411c53750c0b2ee49e8b5e201db554583d019238d0a3d0e35b4f05ec0' 
  AND token = 'gj+jKscq5XOw5GHNWlMl9NJJlEc/j7fOukQOb6pb2SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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