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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae153844e425e4e3dde7a4c2b71cb07d41800458c6bf716ba59a8348583194b' 
  AND token = '32ep0jB5aw0+IQW7FwBqmHznTUlYzfpwOL75w7hDa4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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