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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334d6425b5a140cbd7b832396b4e03d6dc969b71b5d5b7b592c5840814559502' 
  AND token = '5eomSPmiHOcWpKFjSEzBmg4qtj+FNkFlaSDTbmL3U7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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