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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899a6835bfd0587fde55fc5abe2ceb3f212c8cf21051e07c70de8064cb7e5bb2' 
  AND token = 'sihtoCs1LKjckwOXLumQTUeZl+0MK7rKd77HPbUs20U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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