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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67060645bdd9288426b5186cc1e92918102ae9e9d6cc5ab9e478f7361a3c93ff' 
  AND token = 'MDMDicDrznG8SP1l3xzRS+Do4weQybGCwicKbjyEV1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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