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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b02bdc15e5bcc0823721b47d247e29df47c919ae4a32c43a8967b06b58151f' 
  AND token = '+0Hd1ZvHze5TbJAm16x8zyjQZZcHceMeBcEHO4c/0Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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