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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690b39ff826b9550bceb36dcf60282f8c7cce05a60b5eb6ac3a190fd1eb25f39' 
  AND token = '4/sG18MjLQsKZE8DSM9R7fWWWixeW9Ldk8UxvCpza4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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