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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94ee2059f52e1495d04e309e8087e679152bfcd6b215ae397a6755fee1abd81' 
  AND token = 'PlNN42hpYLeD+wu3L02vwVL4mE6fGxE6XOG4dovz97g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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