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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b27e30722c5b2b39991be1a98f2df6070e65972d1c38108a533bb64c132a08' 
  AND token = '99KN7V0YgAywhnYbTf1Q3QDAc+MrEQKf+zUd02W7SCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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