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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4594891c318f97a96c98afeded01ea67ec8167edde1432703a7d9a8df66bf9' 
  AND token = 'OgEkpl/5ZCjOe2pH27Zv4PGznRQDg6A0Nesc5509Gnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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