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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb594ab73f6ab4981716fe436b17b0c78a76ff95d40fa539f6ecd4d8c58a6d1f' 
  AND token = 'CDLc5/QLYukVpLNhVL9pisaYi/xPAsU40zmblUtWIp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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