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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f3f32fe0f7108b44676d5febdf2b72cb2ac9a09b99cd69f8d1e5f637e0e2dc' 
  AND token = 'DI5ut66RcxOlf3lMyhRmQsBM+ZmvB6Tbr7CjN7BR0/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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