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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3861212cf1e87a09b96cd6e438c7422a7fa0eaa63735263af9e3da3eb590e3' 
  AND token = 'E484wE7qXddEa4tV97j1Ju9hc2JjXQT6mkslredlzLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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