SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c5a82bdb90c405fde8e84acd81ee46b3c1efc5c0f69d43da9d62452338dba0' 
  AND token = 'jimb/JUFZjX75+QJTNCzHK4IWfgIhQmJvvlKlmPAyyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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