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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3cdda4b6d7e2b1ea8b0def2958873e5f4442e20b2fd127adaa35e360e66078' 
  AND token = 'wmThcXoJ667w79JGxI18PI3XcqDzLtfpVsHodhBHw1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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