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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d25b0dff9180fae99e3be59ff7c73ab66b393d36f26883bd0c42011b605b731' 
  AND token = 'Kp10jImDx77awdNoKUJgGnsJlpf3k/v7IFa7HC/6mhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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