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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ec96f4823c18a30bfd2135a29a6ed8e109bfb7800d9fe14ab9c6006500cae7' 
  AND token = 'Jjn3IQc5e53YVvKKy/qjXI4Eq4YoTQiLsEV1HuHUwDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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