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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73acbbb8f7d5c3d361b956bd388a7a738b11de3e6f9e2901f2a908f3cf5228f' 
  AND token = 'QNgDodhjcwE2wApNUHoTS1IUoCkECtgEZMvMUME9MgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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