SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bdeedeccafb735c4c1eb6c7e8a5c77f6e497c220a2f9819e338a81fd966810' 
  AND token = 's/fpyJzKtiH9uHVCQkx/cKX5ychhGFrqXBR7qSl8mwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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