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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666649a29cceed3771a9c9cbf724b1c3d58a6639e86505bc2ef02e093c14ec2a' 
  AND token = '588ts3zSd+kmlEbbJuC7KidnzPyq5j5wpyM0KZ0cSwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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