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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfa839f8b1070980ce2b21f28dab5c6bc084c629e11e311443a8ac17d356d14' 
  AND token = 'vw5UVDSuEb7pHAX9cK2FBP0AKrmyWM01GSfyJDrm6iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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