Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5819e43077829d7db5fb80d70560df77ea80979b9ca9204f4398494857d5640' 
  AND token = '8uOyHI7Ico94LmxCDN5znwHxzDPtl1chlfli5YzdgP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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