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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0358a850cdc2635a4678fea14b34eda3e6e868ce8b071745827930e6984757b9' 
  AND token = 'tVx2g4nSFZbVdhopuq/mNFZBUPVgQuWnyGjpai22224=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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