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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd190a7df75f6b4d70d69cc3fe189448f8a8db8c7c9af1f8c7aa9b362e4eb28b8' 
  AND token = '6Pn3lhB6J6Rkppg8dj6SjBXATh54S2/QycXv3s1ZUPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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