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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539f7de2fd87eca85677517b827154d612c554563aed3f060bf66f994d789676' 
  AND token = 'lfcGdKsfXEanwU0ijLrhsC37MMuDL8cGmkJZN7rwq6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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