SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aceae4605afd4358b51f4a0ff60398c366d9053ed2672cc585e931cc0e5783a9' 
  AND token = 'CPBcgwQ+SHheEnPJAVrKgTN2KZuAhgC4V7bj0NZwn/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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