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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e0d6e8f9b1be74129f7d9186082b97fab5120d39663790b3fd1a6a917a67e2' 
  AND token = '5+g02GCjCe6uVY8WFEau5Yt6clwWUfkhe8JI895iFu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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