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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5fbd002a648e947f46e72d54a2923d6f7ad848a06d39bb11ddbd8e01c15189' 
  AND token = '5VREbb6p9bJO3Ww/j/NJnzYxtFXemx14Ij5zOu79iSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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