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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bbb0d6d8b1dff942badb23e6f72a6e2401cd5f70ea37f52015fe046e248ffa' 
  AND token = 'tQ+fB5bKvMm+tekqm7VQ640wDx4PzpKi2O32HJhT8eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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